I’II makes a bet that you’ve never had to relearn that one plus one equals two.
You learned it in grade school and that was it. Check you moved on to subtraction, multiplication, division, fractions, and perhaps into more advanced math such as algebra, geometry, and trigonometry.

    I’m sure you’ve learned many things, most of the time, you don’t to learn the same thing twice. 

   This isn’t how you should approach your growth and maturity in what matters, however. Is knowledge and wisdom part of your growth? Of course. But the knowledge and wisdom you need is as much like good nutrition as it is a sound instruction.

    You might only need to learn something once, but if you eat only once, you’ll die. You have to feed yourself regularly in order to grow strong.

"Man shall not live on bread alone, but on every word that comes from mouth of God." - Matthew 4:4